TY - JOUR
T1 - Control of anisotropic conduction of carbon nanotube sheets and their use as planar-type thermoelectric conversion materials
AU - Matsumoto, Masamichi
AU - Yamaguchi, Ryohei
AU - Shima, Keisuke
AU - Mukaida, Masakazu
AU - Tomita, Motohiro
AU - Watanabe, Takanobu
AU - Ishida, Takao
AU - Fujigaya, Tsuyohiko
N1 - Funding Information:
This study was supported in part by the Nanotechnology Platform Project of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, KAKENHI [No. JP18H01816], and the bilateral program [JPJSBP120208814] of the Japan Society for the Promotion of Science (JSPS), PRESTO [No. JPMJPR15R6], and CREST [No. JPMJCR19Q5] of the Japan Science and Technology Agency (JST), Japan. We also thank Dr. Oya (Shimadzu Corporation, Kyoto Japan) for the measurements using the micro-compression tester.
Publisher Copyright:
© 2021 The Author(s). Published by National Institute for Materials Science in partnership with Taylor & Francis Group.
PY - 2021
Y1 - 2021
N2 - The large anisotropic thermal conduction of a carbon nanotube (CNT) sheet that originates from the in-plane orientation of one-dimensional CNTs is disadvantageous for thermoelectric conversion using the Seebeck effect since the temperature gradient is difficult to maintain in the current flow direction. To control the orientation of the CNTs, polymer particles are introduced as orientation aligners upon sheet formation by vacuum filtration. The thermal conductivities in the in-plane direction decrease as the number of polymer particles in the sheet increases, while that in the through-plane direction increases. Consequently, a greater temperature gradient is observed for the anisotropy-controlled CNT sheet as compared to that detected for the CNT sheet without anisotropy control when a part of the sheet is heated, which results in a higher power density for the planar-type thermoelectric device. These findings are quite useful for the development of flexible and wearable thermoelectric batteries using CNT sheets.
AB - The large anisotropic thermal conduction of a carbon nanotube (CNT) sheet that originates from the in-plane orientation of one-dimensional CNTs is disadvantageous for thermoelectric conversion using the Seebeck effect since the temperature gradient is difficult to maintain in the current flow direction. To control the orientation of the CNTs, polymer particles are introduced as orientation aligners upon sheet formation by vacuum filtration. The thermal conductivities in the in-plane direction decrease as the number of polymer particles in the sheet increases, while that in the through-plane direction increases. Consequently, a greater temperature gradient is observed for the anisotropy-controlled CNT sheet as compared to that detected for the CNT sheet without anisotropy control when a part of the sheet is heated, which results in a higher power density for the planar-type thermoelectric device. These findings are quite useful for the development of flexible and wearable thermoelectric batteries using CNT sheets.
KW - 102 Porous / Nanoporous / Nanostructured materials
KW - 104 Carbon and related materials
KW - 210 Thermoelectronics / Thermal transport / insulators
KW - 50 Energy Materials
KW - Carbon nanotubes
KW - anisotropy
KW - electrical conductivity
KW - polymer particle
KW - sacrificial template
KW - thermal conductivity
KW - thermoelectric conversion
KW - wearable battery
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U2 - 10.1080/14686996.2021.1902243
DO - 10.1080/14686996.2021.1902243
M3 - Article
AN - SCOPUS:85104304383
VL - 22
SP - 272
EP - 279
JO - Science and Technology of Advanced Materials
JF - Science and Technology of Advanced Materials
SN - 1468-6996
IS - 1
ER -